Mail Filtering / Gateway

Proactive Queue Notifications
The Proactive Queue Notifications system sends an email to the domain administrator when we detect messages that have not been delivered to your servers wit...
Fri, 1 Feb, 2019 at 9:37 PM
Bulk Add Filtering Rules: Whitelist / Blacklist
You can request our support team to bulk import your Spam Filtering Rules by sending us a spreadsheet of your whitelist / blacklist:  Create a CSV, XLS...
Fri, 1 Feb, 2019 at 9:39 PM
Email Forwarding bulk import and auto verification
You can request our support team to bulk import your Email Forwarding Rules if you have an annual subscription for the Email Forwarding Service. This proced...
Fri, 1 Feb, 2019 at 10:25 PM
Configure Office365 to only accept mail from the DuoCircle Cloud servers, and ensure mail is not marked as spam
Bypassing Spam Checks   To ensure that emails delivered from our spam filtering service to Office 365 are not incorrectly identified as spam, resulting in...
Fri, 17 May, 2019 at 8:22 PM
Check if the sender domain exists
Monday, September 10, 2018 It's somewhat common check if a sender domain exists before accepting mail. The email RFC has a section that specificall...
Mon, 10 Sep, 2018 at 4:53 PM
How long do you keep SPAM messages in your queue?
Default Mail Queue Retention Policy Email is kept in the mail queue for 30 days, during that time we are attempting to deliver your email to the MX reco...
Fri, 1 Feb, 2019 at 11:08 PM